Your best friend is basically your soulmate. They're always down for the next ridiculous adventure, a much-needed vent, or a night in with a bottle of wine and hours of Netflix. Since you're obviously (Pour Wine Awesome)
What I want to say to my best friend at my wedding: "Dear best friend, He may be the 'love of my life', but you will always be my soulmate." --- but I would tell you "he may be the love of your life but you're my soulmate"